Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from   -0.472 sec. to    2.593 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27231     ( -0.151807   0.153406 )
Norm@50keV  : 7.25603E-03    ( -0.000646427   0.000646162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.42 using 59 PHA bins.
# Reduced chi-squared =         0.9898 for     57 degrees of freedom 
# Null hypothesis probability =   4.968274e-01
 
Photon flux (15-150 keV)    in 3.065 sec: 0.861410 ( -0.078392  0.07851 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.2132e-07 ( -2.18991e-08  2.2108e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.472 sec. to    2.593 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.763803     ( -0.562836   0.668288 )
Epeak [keV] : 124.450      ( -44.8248 -124.45 )
Norm@50keV  : 1.29732E-02    ( -0.00596355   0.0141461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.21 using 59 PHA bins.
# Reduced chi-squared =         0.9680 for     56 degrees of freedom 
# Null hypothesis probability =   5.429880e-01
 
Photon flux (15-150 keV)    in 3.065 sec: 0.843164 ( -0.081272  0.081244 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.12662e-07 ( -2.43839e-08  2.43225e-08 ) ergs/cm2
 

1-s peak spectrum fit

1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.

Time-resolved spectra